I find it quite annoying that when ever I do a search related to ExtJS, two sites (codeweblog.com and defafe.com) are on the first page of results. These two sites simply aggregate ExtJS forum posts, and then present them in a SEO friendly page.
Given this, I took to finding a way that can block search results. Officially, there’s no way you can do that from within Google settings (which would have preserved that as you moved from machine to machine), but there are extensions for Firefox. Still looking for a Chrome one!
For Firefox, there are a few extensions. One is CustomizeGoogle, but it doesnt work in the latest version of Firefox.
The one that does work is SurfClarity. It allows you to list of a sites that should be filtered out. It doesn’t do it from the server-side which would save a 1kb of traffic, but nonetheless is good enough.